Oil prices rose on Monday as investors weighed renewed geopolitical risk despite US President Donald Trump urging other countries to join efforts to secure the Strait of Hormuz, while Iran said the strategic waterway remained open only to countries that are not directly involved in attacks against it.

Brent crude climbed 1% to $104.58 a barrel, while US West Texas Intermediate also traded at nearly $100, extending recent volatility.

Trump said on Sunday his administration was in talks with seven countries to help secure shipping through Hormuz, through which about 20% of global oil passes, and said nations dependent on Gulf energy supplies should contribute naval support.

“I’m demanding that these countries come in and protect their own territory because it is their territory,” Trump told reporters aboard Air Force One while travelling from Florida to Washington. “It’s the place from which they get their energy.”

He did not name the seven countries, but later said in a social media post that he hoped China, France, Japan, South Korea and United Kingdom, among others, would send warships to help keep the waterway open.

Iranian Foreign Minister Abbas Araghchi said the strait remained open to international shipping but excluded vessels linked to countries attacking Iran.

“As a matter of fact, this Strait of Hormuz is open. It is only closed to the tankers and ships belonging to our enemies,” Araghchi said, while also urging other countries to avoid steps that could widen the conflict.

Although Tehran has not declared a full closure, shipping traffic has been sharply reduced as insurers, tanker operators and cargo owners remain cautious amid military threats and recent attacks in nearby waters.

Energy traders remain focused on whether military escorts materialise in coming days, as any broader disruption to Gulf exports could tighten global crude supply further and intensify inflation concerns worldwide.